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Unformatted text preview: MIDTERM Feb 3rd 2006 VERSION C
SEAT Fl 14 PHYSICS 7B WINTER 2006
INSTRUCTOR: MANOJ KAPLINGIIAT Clearly Print
NAME I.D. #
DISCUSSION TA DISCUSSION HOUR ﬁhngLQ/b Wm
SIGNATUR Clear your desk except for a single 8.5 X J I " sheet of notes, pen,
pencil, eraser and calculator.
Problem —
 VERSION C 1 Gas Constant, R = 0.08214 L “m =8.314
mol x K mol x K
Absolute Zero Temperature 2  273 °C Linear Expansion Coefﬁcient for steel, (1 = 1 x 10‘5 /°C I
kgx "C Speciﬁc heat of water, cw = 4186 1. Points [10]
A billiard ball Bl has initial momentum 0.6l kg m/s. Bl strikes a stationary ball B2 lying at rest initially. Immediately after the collision, B2 moves with momentum 0.3 i kg m/s + 0.33 kg m/s. Find the momentum of B] immediately after collision.
Is this collision elastic? BI and B2 have the same mass. (y 93
t. \wj \n: f} 3),» (“f3 1% «tarp/<2 O , E" “9 ‘ a '3 . W: =
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Tom! Kt m of ll 1 l l 0 1‘ l “2L ) VERSION C 2. Points [10]
An unknown quantity of water is heated up in an airtight container of volume 1L until all of the water turns into steam. At this point, the temperature inside the cooker is measured to be 130°C and the pressure 15 atrn.
How many moles of water are in the cooker?
The container is heated further until the steam is at a temperature of 260°C. What is the pressure inside the container now? (1\ P: \Scﬂfﬂ
pr 1: gym and?) 3 Lg ". t2 at.th
\i‘ lL— ‘/
p: (Ed—4““qu ' .H‘DQ‘! ’L Ll‘géjfml .. M35 UtomB)
e} H
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p: YE r I \f ,O'H': ’39..»Lxcy m ( momma .to) \j'<‘&63 Pf‘tﬂvi . OW VERSION C 3. Points [8]
Density of a gas at 0.88 atm pressure and 27°C is measured to be 1.0gﬂ. Find the molar mass (mass of 1 mole) ofthis gas. '  “ﬂ . P ' I\ 3 [we . I If. .
, Hungj \I i I) 35/1, 9‘" 28¢wa
’ _ ,.. ‘{'1 l”
‘i= "23:1er 27 m“ "J VERSION C 4 4. Points [12] k
A square steel plate of side 8.00m at 10°C has a square area of side “20“ : 2.0cm cut out of it. (The star marks the center of the bigger square.) Where is the center of mass ofthz's object located?
This steel object is heated from 10°C to 1010°C. Where is the center of mass now located?
By how much does the area of the cutout region increase? {C W e; _ M: Mature
X : 3— my
Cm ‘ \ﬂ \M r r. v
ET“? Lj—L— Jr L“ t +3. Jr g: i A; T
i '0 I IKE. ‘\ iv‘t ‘. t \ 4.5""‘~ E i"? A I" 1&4: 11s: 4.m257q.eg
M AR:”ﬁhbT [375‘ 1' g r? I. :‘3‘ "fCW‘QX @0035} A , 0 <6; le VERSION C 5 5. Points [6]
Equal amounts of water at 2.7°C and 53°C is poured into a thermos ﬂask and sealed. Assume no heat is lost to surroundings or the ﬂask. What is the temperature of the water at equilibrium?
Compared to the instant at which water is poured into the flask, does the density of the water in the ﬂask go up, down or remain the same once equilibrium is reached? Explain. it“'f.".?'3 #006 y/ [t ‘ [\i‘Il'II‘ .‘. 1" Q0 1mm ‘ t +le “:51 we. a}; 6. Points [4]
“A football shaped (ellipsoidal) metal object will become increasingly spherical as it is heated.” (Assume that the metal does not melt.) Provide an airtight argument for or against this
statement. . . ,  q . . . ,. ~ ,. .n \
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 Spring '06
 Kaplinghat
 Physics

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